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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.io;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.annotations.Beta;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import com.google.common.base.Preconditions;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import com.google.common.hash.Funnels;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import com.google.common.hash.HashCode;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import com.google.common.hash.HashFunction;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import com.google.common.hash.Hasher;<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.io.ByteArrayInputStream;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.io.ByteArrayOutputStream;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.io.DataInput;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.io.DataInputStream;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.io.DataOutput;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.io.DataOutputStream;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.io.EOFException;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import java.io.FilterInputStream;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import java.io.IOException;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import java.io.InputStream;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import java.io.OutputStream;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import java.nio.ByteBuffer;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import java.nio.channels.ReadableByteChannel;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import java.nio.channels.WritableByteChannel;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import java.util.Arrays;<a name="line.43"></a>
<span class="sourceLineNo">044</span>import java.util.zip.Checksum;<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>/**<a name="line.46"></a>
<span class="sourceLineNo">047</span> * Provides utility methods for working with byte arrays and I/O streams.<a name="line.47"></a>
<span class="sourceLineNo">048</span> *<a name="line.48"></a>
<span class="sourceLineNo">049</span> * @author Chris Nokleberg<a name="line.49"></a>
<span class="sourceLineNo">050</span> * @since 1.0<a name="line.50"></a>
<span class="sourceLineNo">051</span> */<a name="line.51"></a>
<span class="sourceLineNo">052</span>@Beta<a name="line.52"></a>
<span class="sourceLineNo">053</span>public final class ByteStreams {<a name="line.53"></a>
<span class="sourceLineNo">054</span>  private static final int BUF_SIZE = 0x1000; // 4K<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>  private ByteStreams() {}<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>  /**<a name="line.58"></a>
<span class="sourceLineNo">059</span>   * Returns a factory that will supply instances of<a name="line.59"></a>
<span class="sourceLineNo">060</span>   * {@link ByteArrayInputStream} that read from the given byte array.<a name="line.60"></a>
<span class="sourceLineNo">061</span>   *<a name="line.61"></a>
<span class="sourceLineNo">062</span>   * @param b the input buffer<a name="line.62"></a>
<span class="sourceLineNo">063</span>   * @return the factory<a name="line.63"></a>
<span class="sourceLineNo">064</span>   */<a name="line.64"></a>
<span class="sourceLineNo">065</span>  public static InputSupplier&lt;ByteArrayInputStream&gt; newInputStreamSupplier(<a name="line.65"></a>
<span class="sourceLineNo">066</span>      byte[] b) {<a name="line.66"></a>
<span class="sourceLineNo">067</span>    return newInputStreamSupplier(b, 0, b.length);<a name="line.67"></a>
<span class="sourceLineNo">068</span>  }<a name="line.68"></a>
<span class="sourceLineNo">069</span><a name="line.69"></a>
<span class="sourceLineNo">070</span>  /**<a name="line.70"></a>
<span class="sourceLineNo">071</span>   * Returns a factory that will supply instances of<a name="line.71"></a>
<span class="sourceLineNo">072</span>   * {@link ByteArrayInputStream} that read from the given byte array.<a name="line.72"></a>
<span class="sourceLineNo">073</span>   *<a name="line.73"></a>
<span class="sourceLineNo">074</span>   * @param b the input buffer<a name="line.74"></a>
<span class="sourceLineNo">075</span>   * @param off the offset in the buffer of the first byte to read<a name="line.75"></a>
<span class="sourceLineNo">076</span>   * @param len the maximum number of bytes to read from the buffer<a name="line.76"></a>
<span class="sourceLineNo">077</span>   * @return the factory<a name="line.77"></a>
<span class="sourceLineNo">078</span>   */<a name="line.78"></a>
<span class="sourceLineNo">079</span>  public static InputSupplier&lt;ByteArrayInputStream&gt; newInputStreamSupplier(<a name="line.79"></a>
<span class="sourceLineNo">080</span>      final byte[] b, final int off, final int len) {<a name="line.80"></a>
<span class="sourceLineNo">081</span>    checkNotNull(b);<a name="line.81"></a>
<span class="sourceLineNo">082</span>    return new InputSupplier&lt;ByteArrayInputStream&gt;() {<a name="line.82"></a>
<span class="sourceLineNo">083</span>      @Override<a name="line.83"></a>
<span class="sourceLineNo">084</span>      public ByteArrayInputStream getInput() {<a name="line.84"></a>
<span class="sourceLineNo">085</span>        return new ByteArrayInputStream(b, off, len);<a name="line.85"></a>
<span class="sourceLineNo">086</span>      }<a name="line.86"></a>
<span class="sourceLineNo">087</span>    };<a name="line.87"></a>
<span class="sourceLineNo">088</span>  }<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>  /**<a name="line.90"></a>
<span class="sourceLineNo">091</span>   * Writes a byte array to an output stream from the given supplier.<a name="line.91"></a>
<span class="sourceLineNo">092</span>   *<a name="line.92"></a>
<span class="sourceLineNo">093</span>   * @param from the bytes to write<a name="line.93"></a>
<span class="sourceLineNo">094</span>   * @param to the output supplier<a name="line.94"></a>
<span class="sourceLineNo">095</span>   * @throws IOException if an I/O error occurs<a name="line.95"></a>
<span class="sourceLineNo">096</span>   */<a name="line.96"></a>
<span class="sourceLineNo">097</span>  public static void write(byte[] from,<a name="line.97"></a>
<span class="sourceLineNo">098</span>      OutputSupplier&lt;? extends OutputStream&gt; to) throws IOException {<a name="line.98"></a>
<span class="sourceLineNo">099</span>    checkNotNull(from);<a name="line.99"></a>
<span class="sourceLineNo">100</span>    checkNotNull(to);<a name="line.100"></a>
<span class="sourceLineNo">101</span>    Closer closer = Closer.create();<a name="line.101"></a>
<span class="sourceLineNo">102</span>    try {<a name="line.102"></a>
<span class="sourceLineNo">103</span>      OutputStream out = closer.add(to.getOutput());<a name="line.103"></a>
<span class="sourceLineNo">104</span>      out.write(from);<a name="line.104"></a>
<span class="sourceLineNo">105</span>    } catch (Throwable e) {<a name="line.105"></a>
<span class="sourceLineNo">106</span>      throw closer.rethrow(e, IOException.class);<a name="line.106"></a>
<span class="sourceLineNo">107</span>    } finally {<a name="line.107"></a>
<span class="sourceLineNo">108</span>      closer.close();<a name="line.108"></a>
<span class="sourceLineNo">109</span>    }<a name="line.109"></a>
<span class="sourceLineNo">110</span>  }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>  /**<a name="line.112"></a>
<span class="sourceLineNo">113</span>   * Opens input and output streams from the given suppliers, copies all<a name="line.113"></a>
<span class="sourceLineNo">114</span>   * bytes from the input to the output, and closes the streams.<a name="line.114"></a>
<span class="sourceLineNo">115</span>   *<a name="line.115"></a>
<span class="sourceLineNo">116</span>   * @param from the input factory<a name="line.116"></a>
<span class="sourceLineNo">117</span>   * @param to the output factory<a name="line.117"></a>
<span class="sourceLineNo">118</span>   * @return the number of bytes copied<a name="line.118"></a>
<span class="sourceLineNo">119</span>   * @throws IOException if an I/O error occurs<a name="line.119"></a>
<span class="sourceLineNo">120</span>   */<a name="line.120"></a>
<span class="sourceLineNo">121</span>  public static long copy(InputSupplier&lt;? extends InputStream&gt; from,<a name="line.121"></a>
<span class="sourceLineNo">122</span>      OutputSupplier&lt;? extends OutputStream&gt; to) throws IOException {<a name="line.122"></a>
<span class="sourceLineNo">123</span>    checkNotNull(from);<a name="line.123"></a>
<span class="sourceLineNo">124</span>    checkNotNull(to);<a name="line.124"></a>
<span class="sourceLineNo">125</span>    Closer closer = Closer.create();<a name="line.125"></a>
<span class="sourceLineNo">126</span>    try {<a name="line.126"></a>
<span class="sourceLineNo">127</span>      InputStream in = closer.add(from.getInput());<a name="line.127"></a>
<span class="sourceLineNo">128</span>      OutputStream out = closer.add(to.getOutput());<a name="line.128"></a>
<span class="sourceLineNo">129</span>      return copy(in, out);<a name="line.129"></a>
<span class="sourceLineNo">130</span>    } catch (Throwable e) {<a name="line.130"></a>
<span class="sourceLineNo">131</span>      throw closer.rethrow(e, IOException.class);<a name="line.131"></a>
<span class="sourceLineNo">132</span>    } finally {<a name="line.132"></a>
<span class="sourceLineNo">133</span>      closer.close();<a name="line.133"></a>
<span class="sourceLineNo">134</span>    }<a name="line.134"></a>
<span class="sourceLineNo">135</span>  }<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span>  /**<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * Opens an input stream from the supplier, copies all bytes from the<a name="line.138"></a>
<span class="sourceLineNo">139</span>   * input to the output, and closes the input stream. Does not close<a name="line.139"></a>
<span class="sourceLineNo">140</span>   * or flush the output stream.<a name="line.140"></a>
<span class="sourceLineNo">141</span>   *<a name="line.141"></a>
<span class="sourceLineNo">142</span>   * @param from the input factory<a name="line.142"></a>
<span class="sourceLineNo">143</span>   * @param to the output stream to write to<a name="line.143"></a>
<span class="sourceLineNo">144</span>   * @return the number of bytes copied<a name="line.144"></a>
<span class="sourceLineNo">145</span>   * @throws IOException if an I/O error occurs<a name="line.145"></a>
<span class="sourceLineNo">146</span>   */<a name="line.146"></a>
<span class="sourceLineNo">147</span>  public static long copy(InputSupplier&lt;? extends InputStream&gt; from,<a name="line.147"></a>
<span class="sourceLineNo">148</span>      OutputStream to) throws IOException {<a name="line.148"></a>
<span class="sourceLineNo">149</span>    checkNotNull(from);<a name="line.149"></a>
<span class="sourceLineNo">150</span>    checkNotNull(to);<a name="line.150"></a>
<span class="sourceLineNo">151</span>    Closer closer = Closer.create();<a name="line.151"></a>
<span class="sourceLineNo">152</span>    try {<a name="line.152"></a>
<span class="sourceLineNo">153</span>      InputStream in = closer.add(from.getInput());<a name="line.153"></a>
<span class="sourceLineNo">154</span>      return copy(in, to);<a name="line.154"></a>
<span class="sourceLineNo">155</span>    } catch (Throwable e) {<a name="line.155"></a>
<span class="sourceLineNo">156</span>      throw closer.rethrow(e, IOException.class);<a name="line.156"></a>
<span class="sourceLineNo">157</span>    } finally {<a name="line.157"></a>
<span class="sourceLineNo">158</span>      closer.close();<a name="line.158"></a>
<span class="sourceLineNo">159</span>    }<a name="line.159"></a>
<span class="sourceLineNo">160</span>  }<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span>  /**<a name="line.162"></a>
<span class="sourceLineNo">163</span>   * Opens an output stream from the supplier, copies all bytes from the input<a name="line.163"></a>
<span class="sourceLineNo">164</span>   * to the output, and closes the output stream. Does not close or flush the<a name="line.164"></a>
<span class="sourceLineNo">165</span>   * input stream.<a name="line.165"></a>
<span class="sourceLineNo">166</span>   *<a name="line.166"></a>
<span class="sourceLineNo">167</span>   * @param from the input stream to read from<a name="line.167"></a>
<span class="sourceLineNo">168</span>   * @param to the output factory<a name="line.168"></a>
<span class="sourceLineNo">169</span>   * @return the number of bytes copied<a name="line.169"></a>
<span class="sourceLineNo">170</span>   * @throws IOException if an I/O error occurs<a name="line.170"></a>
<span class="sourceLineNo">171</span>   * @since 10.0<a name="line.171"></a>
<span class="sourceLineNo">172</span>   */<a name="line.172"></a>
<span class="sourceLineNo">173</span>  public static long copy(InputStream from,<a name="line.173"></a>
<span class="sourceLineNo">174</span>      OutputSupplier&lt;? extends OutputStream&gt; to) throws IOException {<a name="line.174"></a>
<span class="sourceLineNo">175</span>    checkNotNull(from);<a name="line.175"></a>
<span class="sourceLineNo">176</span>    checkNotNull(to);<a name="line.176"></a>
<span class="sourceLineNo">177</span>    Closer closer = Closer.create();<a name="line.177"></a>
<span class="sourceLineNo">178</span>    try {<a name="line.178"></a>
<span class="sourceLineNo">179</span>      OutputStream out = closer.add(to.getOutput());<a name="line.179"></a>
<span class="sourceLineNo">180</span>      return copy(from, out);<a name="line.180"></a>
<span class="sourceLineNo">181</span>    } catch (Throwable e) {<a name="line.181"></a>
<span class="sourceLineNo">182</span>      throw closer.rethrow(e, IOException.class);<a name="line.182"></a>
<span class="sourceLineNo">183</span>    } finally {<a name="line.183"></a>
<span class="sourceLineNo">184</span>      closer.close();<a name="line.184"></a>
<span class="sourceLineNo">185</span>    }<a name="line.185"></a>
<span class="sourceLineNo">186</span>  }<a name="line.186"></a>
<span class="sourceLineNo">187</span><a name="line.187"></a>
<span class="sourceLineNo">188</span>  /**<a name="line.188"></a>
<span class="sourceLineNo">189</span>   * Copies all bytes from the input stream to the output stream.<a name="line.189"></a>
<span class="sourceLineNo">190</span>   * Does not close or flush either stream.<a name="line.190"></a>
<span class="sourceLineNo">191</span>   *<a name="line.191"></a>
<span class="sourceLineNo">192</span>   * @param from the input stream to read from<a name="line.192"></a>
<span class="sourceLineNo">193</span>   * @param to the output stream to write to<a name="line.193"></a>
<span class="sourceLineNo">194</span>   * @return the number of bytes copied<a name="line.194"></a>
<span class="sourceLineNo">195</span>   * @throws IOException if an I/O error occurs<a name="line.195"></a>
<span class="sourceLineNo">196</span>   */<a name="line.196"></a>
<span class="sourceLineNo">197</span>  public static long copy(InputStream from, OutputStream to)<a name="line.197"></a>
<span class="sourceLineNo">198</span>      throws IOException {<a name="line.198"></a>
<span class="sourceLineNo">199</span>    checkNotNull(from);<a name="line.199"></a>
<span class="sourceLineNo">200</span>    checkNotNull(to);<a name="line.200"></a>
<span class="sourceLineNo">201</span>    byte[] buf = new byte[BUF_SIZE];<a name="line.201"></a>
<span class="sourceLineNo">202</span>    long total = 0;<a name="line.202"></a>
<span class="sourceLineNo">203</span>    while (true) {<a name="line.203"></a>
<span class="sourceLineNo">204</span>      int r = from.read(buf);<a name="line.204"></a>
<span class="sourceLineNo">205</span>      if (r == -1) {<a name="line.205"></a>
<span class="sourceLineNo">206</span>        break;<a name="line.206"></a>
<span class="sourceLineNo">207</span>      }<a name="line.207"></a>
<span class="sourceLineNo">208</span>      to.write(buf, 0, r);<a name="line.208"></a>
<span class="sourceLineNo">209</span>      total += r;<a name="line.209"></a>
<span class="sourceLineNo">210</span>    }<a name="line.210"></a>
<span class="sourceLineNo">211</span>    return total;<a name="line.211"></a>
<span class="sourceLineNo">212</span>  }<a name="line.212"></a>
<span class="sourceLineNo">213</span><a name="line.213"></a>
<span class="sourceLineNo">214</span>  /**<a name="line.214"></a>
<span class="sourceLineNo">215</span>   * Copies all bytes from the readable channel to the writable channel.<a name="line.215"></a>
<span class="sourceLineNo">216</span>   * Does not close or flush either channel.<a name="line.216"></a>
<span class="sourceLineNo">217</span>   *<a name="line.217"></a>
<span class="sourceLineNo">218</span>   * @param from the readable channel to read from<a name="line.218"></a>
<span class="sourceLineNo">219</span>   * @param to the writable channel to write to<a name="line.219"></a>
<span class="sourceLineNo">220</span>   * @return the number of bytes copied<a name="line.220"></a>
<span class="sourceLineNo">221</span>   * @throws IOException if an I/O error occurs<a name="line.221"></a>
<span class="sourceLineNo">222</span>   */<a name="line.222"></a>
<span class="sourceLineNo">223</span>  public static long copy(ReadableByteChannel from,<a name="line.223"></a>
<span class="sourceLineNo">224</span>      WritableByteChannel to) throws IOException {<a name="line.224"></a>
<span class="sourceLineNo">225</span>    checkNotNull(from);<a name="line.225"></a>
<span class="sourceLineNo">226</span>    checkNotNull(to);<a name="line.226"></a>
<span class="sourceLineNo">227</span>    ByteBuffer buf = ByteBuffer.allocate(BUF_SIZE);<a name="line.227"></a>
<span class="sourceLineNo">228</span>    long total = 0;<a name="line.228"></a>
<span class="sourceLineNo">229</span>    while (from.read(buf) != -1) {<a name="line.229"></a>
<span class="sourceLineNo">230</span>      buf.flip();<a name="line.230"></a>
<span class="sourceLineNo">231</span>      while (buf.hasRemaining()) {<a name="line.231"></a>
<span class="sourceLineNo">232</span>        total += to.write(buf);<a name="line.232"></a>
<span class="sourceLineNo">233</span>      }<a name="line.233"></a>
<span class="sourceLineNo">234</span>      buf.clear();<a name="line.234"></a>
<span class="sourceLineNo">235</span>    }<a name="line.235"></a>
<span class="sourceLineNo">236</span>    return total;<a name="line.236"></a>
<span class="sourceLineNo">237</span>  }<a name="line.237"></a>
<span class="sourceLineNo">238</span><a name="line.238"></a>
<span class="sourceLineNo">239</span>  /**<a name="line.239"></a>
<span class="sourceLineNo">240</span>   * Reads all bytes from an input stream into a byte array.<a name="line.240"></a>
<span class="sourceLineNo">241</span>   * Does not close the stream.<a name="line.241"></a>
<span class="sourceLineNo">242</span>   *<a name="line.242"></a>
<span class="sourceLineNo">243</span>   * @param in the input stream to read from<a name="line.243"></a>
<span class="sourceLineNo">244</span>   * @return a byte array containing all the bytes from the stream<a name="line.244"></a>
<span class="sourceLineNo">245</span>   * @throws IOException if an I/O error occurs<a name="line.245"></a>
<span class="sourceLineNo">246</span>   */<a name="line.246"></a>
<span class="sourceLineNo">247</span>  public static byte[] toByteArray(InputStream in) throws IOException {<a name="line.247"></a>
<span class="sourceLineNo">248</span>    ByteArrayOutputStream out = new ByteArrayOutputStream();<a name="line.248"></a>
<span class="sourceLineNo">249</span>    copy(in, out);<a name="line.249"></a>
<span class="sourceLineNo">250</span>    return out.toByteArray();<a name="line.250"></a>
<span class="sourceLineNo">251</span>  }<a name="line.251"></a>
<span class="sourceLineNo">252</span><a name="line.252"></a>
<span class="sourceLineNo">253</span>  /**<a name="line.253"></a>
<span class="sourceLineNo">254</span>   * Returns the data from a {@link InputStream} factory as a byte array.<a name="line.254"></a>
<span class="sourceLineNo">255</span>   *<a name="line.255"></a>
<span class="sourceLineNo">256</span>   * @param supplier the factory<a name="line.256"></a>
<span class="sourceLineNo">257</span>   * @throws IOException if an I/O error occurs<a name="line.257"></a>
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<span class="sourceLineNo">1001</span>}<a name="line.1001"></a>




























































</pre>
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